NEC ND3550A 1.05 burn problems

I have constant problems with this drive. I get good backups bu I have to restart the pc between every one to lessen the chances of a coaster. The error mesage I get in Nero 6 is ‘power connection error’ or something similar. Is this a common problem with this drive?
I dont know if a firmware update will help me but I dont know how to do it anyway.
Any help would be greatly appreciated.